Automatic cut-off.



No. 804,978. PATENTED NOV. 21, 1905. A. D. PURTLE 6: I. E. ROWLAND. AUTOMATIC GUT-OFF.

APPLICATION FILED JUNE 15, 1905.

Inventors,

Attorneys UNITED STATES PATENT OFFICE.

ALBERT D. PURTLE, OF SALEM, WEST VIRGINIA, AND IRVEN E. ROWLAND,

' OF MARIETTA, OHIO.

AUTOMATIC CUT-OFF.

Specification of Letters Patent.

Patented Nov. 21, 1905.

To all whom it may concern:

Beitknown that we, ALBERT D. PURTLE, residing at Salem, in the county of Harrison and State of West Virginia, and IRVEN E. Row- LAND, residing at Marietta, in the county of Washington and State of Ohio, citizens of the United States, have invented a new and useful Automatic Out-Ofi, of which the following is a specification.

Our-invention relates to automatic cut-offs, and especially to cut-offs for use upon gas service-pipes.

The object of our invention is to provide a device of the class which will remain open solong as the gas remains under tension and to close automatically when the gas is relieved from tension and to remain closed until manually opened.

It is well known that from one cause or another the flow of gas in service-pipes occasionally stops and any flames burning will be extinguished. When the flow once more begins, unless some means is provided for checking the flow the gas escapes from the open and unlighted burners.

It is an object of our invention to provide a valveintroduced into theservice-pipe which is controlled by a diaphragm acted upon by the tension of the gas and after it has passed through the valve. When the gas-pressure fails, a weight closes the valve, and the passage to the diaphragm is also closed to prevent the admission of gas to the diaphragmcasing until the valve is manually opened.

With these and other objects in view the present invention consists in the combination and arrangement of parts, as will be hereinafter fully described, shown in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that changes in the form, proportion, size, and minor details may be made without departing from the spirit of the invention or sacrificing any of its advantages.

In the drawings, Figure 1 is a vertical sectional view of our improved automatic cutoff. Fig. 2 is a detail vertical sectional view of the means for coupling the weight-lever to the valve-stem and taken on line 2 2 of Fig. 1.

In its preferred embodiment our improved automatic cut-ofi? combines a valve-casing 1, arranged for connection with the inlet-pipe 2 and the outlet-pipe 3, forming the usual gas service-pipe. The valve-easing 1 is provided with adiagonaldiaphragm Loi" ordinary form and provided with a valve-seat 5. The valvecasing 1 is provided at its upper side with an opening 6, internally screw-threaded and in which is secured a cross-head 7, having outwardly-extending arms 8 and a central stuffing-box 9. Slidably passing through the stufiing-box 9 is the tubular valve-stem 10, carrying the valve 11 upon its end within the valve-easing. The valve 11 may be of any approved form and material, but is here shown as composed of elastic material and in the form of an elongated spheroid held by the nuts 12 and 13.

The outer ends of the arms 8 are provided with openings 14:, within which are secured the standards 15 and 16 by the nuts 17. Upon the upper ends of the standards 15 and 16 is disposed a diaphragm-casing 18, composed of the dished sections 19 and 20, provided, respectively, with outstanding flanges 21 and 22, secured together by the bolts 23 and clamping the periphery of the elastic diaphragm 24. The casing-section 19 is provided with an axially-disposed stuffing-box 25, through which passes the valve-stem 10. The tubular stem 10 is secured to the center of diaphragm 24, as by the nuts 26 and washers 27 and is provided with an opening 28, communicating with the interior of the diaphragmcasing and below the diaphragm. At any convenient point the casing-section 20 is provided with an aperture 29, forming communication between the casing above the diaphragm and the atmosphere.

Upon the standard 15 and intermediate the ends is pivoted the bifurcated lever 30, looselyembracing the standard 16 and the valve-stem 10 and provided with a longitudinally-adjusted weight 31. Upon the valve-stem is rigidly secured a bearing-block 32, upon which bears the arms of the lever 30, and a bail 33 passes over the lever and pivots in the block 32.

The operation of our improved automatic cut-off is as follows: The parts will be normally held by the weight 31 in the position shown in dotted lines, seating the valve 11 in the seat 5. After being connected with the service-pipe 2 3 the lever 30 is manually raised to full-line position, which permits the pas-v sage of gas through the seat 5. When the pipes have been filled and the tension thereby raised, the gas will enter the lower open end of tubular valve-stem 10 and pass out through the opening 28 within the diaphragm-casing 18 and below the diaphragm 24, sustaining the diaphragm by its tension andholding the valve in an open position. So long as the tension of the gas is maintained the pressure thereof on the diaphragm 24: will hold the valve 11 unseated and permit an uninterrupted flow. When for any reason the gas-pressure fails, the weight 31 will close the valve 11, drawing the diaphragm down to the dotted position. When the valve is closed, it is obvious that the opening in the lower end of valve-stem 10 is protected from the inlet-passage, so that should the-gas-pressure be restored the valve will not be thereby opened, but will remain closed until manually opened, as above described.

Having thus described the invention, what is claimed is- 1. A device of the class described comprising, a pipe conducting a fluid under tension, avalve introduced into and capable of closing the pipe, a diaphragm-casing, a diaphragm mounted within the casing, a tubular stem connecting the valve and the diaphragm and provided with openings into the diaphragmcasing and through the valve, anda weighted lever bearing upon the valve-stem and arranged to hold the valve normally closed.

2. In a device of the class described, a valvechamber, a valve within the chamber, a diaphragm-casing supported above the valvechamber, a diaphragm mounted Within the casing, a duct leading from the chamber to the casing and connecting the valve and diaphragm and alever between the chamber and casing and connected to the duct.

3. 1n adevice of the class described, avalvechamber, a valve within the chamber, a diaphragm-casing supported above the valvechamber, a flexible diaphragm within the easing, a hollow stem connecting the valve and diaphragm, a lever pivoted to the diaphragmsupport and bearing upon the stem, and a weight mounted upon the lever.

In testimony that we claim the foregoing as our own we have hereto aflixed our signatures in the presence of two witnesses.

' ALBERT D. PURTLE.

IRVEN E. ROWLAND. WVitnesses:

JAMES M. URE, THEODORE B. GILBERT. 

